Importance

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Abstract

Method for safeguarding access to digital data carrier, in particular DVD or another data carrier based on DVD standard. Playback data on these data carriers includes pre-commands or post-commands before or after the playback data. The user may be prompted, before each playback, to input a key through pre-command or post-command. This key may be obtained or purchased via a support centre. To prevent the same key from being used for each playback operation, the keys are preferably in pairs, one part determined automatically by processing the pre-commands and post-commands and the other part obtained from the support centre. Prior to each playback operation the key or pair of keys is verified after inputting the other part of the pair of keys. If key verification is negative, data playback is cancelled. If key verification is positive, the data is played back after being released for playback.

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First Claim